#include<bits/stdc++.h>
#define ll long long
#define ull unsigned long long
using namespace std;

const ll N = 1e6 + 10, INF = 0x3f3f3f3f;

ll n, q;
ll a[N], b[N];

void solve()
{
    cin >> n >> q;
    for (ll i = 1;i <= n;i++) cin >> a[i];
    for (ll i = 1;i <= n;i++) cin >> b[i];
    ll ans = 0;
    for (ll i = 1;i <= n;i++) ans += min(a[i], b[i]);


    char op;ll x, v;
    while (q--) {
        cin >> op >> x >> v;
        ll odd = min(a[x], b[x]);
        if (op == 'A') {
            a[x] = v;
        } else {
            b[x] = v;
        }
        ll nw = min(a[x], b[x]);
        ans += nw - odd;
        cout << ans << '\n';
    }
}

signed main()
{
    //ios::sync_with_stdio(0);
    //cin.tie(0);cout.tie(0);
#define ONLINE_JUDGE
#ifndef ONLINE_JUDGE
    std::istringstream in(R"()");
    std::cin.rdbuf(in.rdbuf());
#endif
    ll T = 1;
    //cin>>T;
    for (ll i = 1;i <= T;i++) {
        solve();
    }
}